can green
Regular verb: green - greened- greened

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can green
you can green
he can green
we can green
you can green
they can green 	I can be greening
you can be greening
he can be greening
we can be greening
you can be greening
they can be greening	I can have greened
you can have greened
he can have greened
we can have greened
you can have greened
they can have greened	I can have been greening
you can have been greening
he can have been greening
we can have been greening
you can have been greening
they can have been greening	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't green
you can't green
he can't green
we can't green
you can't green
they can't green 	I can't be greening
you can't be greening
he can't be greening
we can't be greening
you can't be greening
they can't be greening	I can't have greened
you can't have greened
he can't have greened
we can't have greened
you can't have greened
they can't have greened	I can't have been greening
you can't have been greening
he can't have been greening
we can't have been greening
you can't have been greening
they can't have been greening	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I green?
can you green?
can he green?
can we green?
can you green?
can they green? 	can I be greening?
can you be greening?
can he be greening?
can we be greening?
can you be greening?
can they be greening? 	can I have greened?
can you have greened?
can he have greened?
can we have greened?
can you have greened?
can they have greened? 	can I have been greening?
can you have been greening?
can he have been greening?
can we have been greening?
can you have been greening?
can they have been greening? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I green?
can't you green?
can't he green?
can't we green?
can't you green?
can't they green? 	can't I be greening?
can't you be greening?
can't he be greening?
can't we be greening?
can't you be greening?
can't they be greening? 	can't I have greened?
can't you have greened?
can't he have greened?
can't we have greened?
can't you have greened?
can't they have greened? 	can't I have been greening?
can't you have been greening?
can't he have been greening?
can't we have been greening?
can't you have been greening?
can't they have been greening?